Ressource pédagogique : Cardiovascular Clinical Trialists (CVCT) Forum – Paris 2012 : How should diagnostic/prognostic markers be studied?

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Title : Cardiovascular Clinical Trialists (CVCT) Forum – Paris 2012 : How should diagnostic/prognostic markers be studied? Speaker: Jim JANUZZI, Boston, USA Discussant: James SNIDER, Critical Diagnostics, USA Abstract : How should Diagnostic and Prognostic Markers Be Studied? The measurement of biomarkers for diagnosis and prognosis in heart disease has changed the fundamental way that patients are evaluated, and has led to a literal explosion of studies exploring both novel applications of established biomarkers as well as the discovery of newer biological markers. With the rise in interest in novel biomarkers has come a clear heterogeneity in the approach with which these potentially important tests have been studied, partially due to a lack of guidance as to nominal expectations for the approach for their evaluation. To this point, there is no consensus yet articulated with respect to the minimum expectations for which a new diagnostic or prognostic biomarker should be held to in order to clarify or reject their potential value. We recently proposed several standards to which novel biomarkers in heart failure should be held during their evaluation (Table) (1); these “rules” do not specifically apply to heart failure per se, and could thus theoretically serve as a starting point for determining the basic framework upon which the evaluation of novel applications of prior markers or the description of a frankly new biomarker. 1. The method by which a novel biomarker is judged (including and especially when compared to or in combination with other biomarkers) should be thorough: novel tests should be evaluated across a wide range of patients typical of the diagnosis for which it will be applied, and the statistical methods used to evaluate the biomarker (relative to clinical variables as well as other biomarkers) should be contemporary, rigorous, standardized and fair. 2. Measurement of a novel HF biomarker (e.g. in blood, urine or any easy obtainable tissue) should be easily achieved within a short period of time, provide acceptable accuracy and assays for its measurement should have defined biological variation and low analytical imprecision. 3. The biomarker should primarily reflect important (patho) physiological process(es) involved in HF presence and progression; use of biomarkers reflective of disease but originating outside the myocardium is acceptable as long as such a biomarker provides independently useful information involved in the diagnosis, prognosis, progression or therapy of HF syndromes. 4. The biomarker must provide clinically useful information for caregivers (physician, nurses, patient and others) to more swiftly and reliably establish/reject a diagnosis, to more accurately estimate prognosis, or to inform more successful therapeutic strategies. The information from such a biomarker should not recapitulate clinical information already available at the bedside, and must be additional to other biomarkers. L’auteur n’a pas transmis de conflit d’intérêt concernant les données diffusées dans cette vidéo ou publiées dans la référence citée. 9th Global Cardiovascular Clinical Trialists Forum • Paris 2012 WHAT IS THE OPTIMAL DESIGN FOR BIOMARKER STUDIES? Chairpersons: Jim JANUZZI, Boston, USA - Faiez ZANNAD, Nancy, FRA Réalisation, production : Canal U/3S et CERIMES Keyword : Cardiovascular Clinical Trialists, Paris, 2012, Cardiovascular prevention, cardiovascular pharmacology, biomarker

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• Sciences médicales. Médecine (610)

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